splice: only read in as much information as there is pipe buffer space
Andreas Grünbacher reports that on the two filesystems that support
iomap directio, it's possible for splice() to return -EAGAIN (instead of
a short splice) if the pipe being written to has less space available in
its pipe buffers than the length supplied by the calling process.
Months ago we fixed splice_direct_to_actor to clamp the length of the
read request to the size of the splice pipe. Do the same to do_splice.
Fixes: 17614445576b6 ("splice: don't read more than available pipe space")
Reported-by: Andreas Grünbacher <firstname.lastname@example.org>
Reviewed-by: Andreas Grünbacher <email@example.com>
Signed-off-by: Darrick J. Wong <firstname.lastname@example.org>
1 file changed